induction motors have very little starting torque
as the motor come up to speed it reduces the torque load until it gets near synchronous speed
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The voltage tag on a motor says 120 or 220 volt and some motors have jumpers to wire it for either one. That is the supply line voltage. The motor knows how to use that. If the plate says three phase is required then consult your electic supply Company for a three phase supply line.
read the name plate on the motor
I'm not sure I understand the question. If you are asking if it's single or 3 phase, this will be marked on the name plate.
On a normal three phase motor on the nameplate there is a value in the S.F. box. This is the service factor. Depending on the size of the motor this value will vary. Smaller size motors usually have a service factor of 1.15.See related links below.
a 3 phase 415 volts 50 HZ 15 HP motor draws: 1. On no load 3.6 amp after a starting kick of around 18AMP 2. On a full load : a starting kick of 108 amp for few seconds and then18.3 amp. 3. On rated load(this means the motor is selected such that the load is 80% of the motor capacity) 14.64 amp with a starting kick of 88Amp.